<template>
  <view>
    <view class="search-box">
      <!-- 官方组件 -->
      <!-- 搜索框 -->
      <uni-search-bar @input="input" :radius="100" cancel-button="none"></uni-search-bar>
    </view>
    
    <!-- 搜索详情 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
      <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 防抖处理
        // 延时器的 timerId
        timer:null,
        // 搜索关键字
        kw:'',
        // 搜索的结果列表
        searchResults:[],
        // 搜索历史记录
        historyList:['a','app','uni']
      };
    },
    
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    
    methods: {
      // input输入事件的处理函数
      input(e) {
        
        clearTimeout(this.timer)
        
        this.timer = setTimeout(() => {
          // console.log(e)
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      
      // 获取搜索建议
      async getSearchList() {
        //  判断搜索关键词是否为空
        if(this.kw.length === 0) {
          this.searchResults = []
          return
        }
        const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      
      // 跳转到商品详情页面
      gotoDetail(item) {
        // console.log(item.goods_id)
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      
      // 搜错保存历史记录
      saveSearchHistory() {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      
      // 清空历史记录
      clean() {
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      
      // 跳转商品详情
      gotoGoodsList(kw) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw 
        })
      }
    },
    
    // 计算数组
    computed: {
      histories() {
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  // 设置定位效果为“吸顶”
  position: sticky;
  // 吸顶的“位置”
  top: 0;
  // 提高层级，防止被轮播图覆盖
  z-index: 999;
}

.sugg-list {
    padding:0 5px;
   .sugg-item {
     font-size:12px;
     padding:13px 0;
     border-bottom:1px solid #efefef;
     display: flex;
     align-items: center;
     justify-content: space-between;
     .goods-name {
       white-space: nowrap;
       overflow: hidden;
       text-overflow:ellipsis;
     }
   }
}

.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}

</style>
